Self-standing yard waste bag

I'm looking for a light-weight self-standing yard waste bag for hauling clippings and weeds to-and-from the green bin. Something in the 16-to-32-gallon size would be ideal. I've attached an example photo, but they come in many variations.

It seems like a lot of these are sold in packs of two or three, so maybe someone has an extra one to spare?

Thanks,

Andy